The largest cut alexandrite is 141.92 carats (28.38 grams; 1 oz) and measures 34.42 x 27.38 x 15.00 mm (1.35 x 1.07 x 0.59 in). Its owner is an anonymous Japanese.
The most distinctive feature about alexandrite is its ability to change its colour. It is green by daylight and red by incandescent light.
Comments below may relate to previous holders of this record.